Transmission lock



.May 14, 1929. C, L JQHNSQN 1,712,500

TRANSMISSION LOCK Original Filed NOV. 24, 1926 Patented May '14, 1929..

UNITED STATES oonvm L. Jonsson, or sfr. Louis, Missouri; Assienonnrnissan .assrenivrniirs nur ` 7 rro .manson Au'roivronrnn noci: co., orsr. Louis, rrisso'o'ni, A oonronnfrion or Missounr.

Application led November 24, 1026, Serial No. 150,424. `Renewed October6, 1552.8.

This invention relates and more particularly to improved means forenablingthe convenient assembly and preventing the unauthorized removalthereof.

One object ofthe present invention is to simplify the constructionandimprove the operation of devices of the character mentioned. i y

Another object is to provide means whereby a transmission lock or thelike may be readily assembled to prevent the unauthorized re movalthereof. v

further object is to provide novel means to prevent the removal of thetransmission lock assembly when in its inoperative position.

Other objects and advantages will appear from the followingr descriptionof an illustrated embodiment of tliepresent invention.

In the drawings:

Figure 1 is a. sectional view of a transmis sion lock embodying featuresof the present f invention. y Y

Figure 2 is a sectional view taken substantially along line Il-II ofFigure 1.

Figure 3 is a sectional view taken substantially along line III-III ofFigure 1.

Figure 4 is a sectional view taken substantially along line IV--IV ofFigure 1.

The structure selected for illustration is shown associated withtransmission housing 10 of standard construction, whereinthe usual gearshifting rods 11 are slidably mounted, they being` provided withconfrontingarcuate recessed portions 12 for selectively receiving a lockplunger 13 to be hereinafter described. The housing 10 is, in thisinstance, provided with a boss 10 which is centrally bored to receive abarrel 14C which is brazed or otherwise secured to a casing 1 5 adaptedto receive a key-operated tumbler lock 16 Vof standard construction.`rlhe barrel 111 is provided with an axial bore 17 for a portion of thelength thereof, it terminating; in an enlarged passage 13 extendingaxially of the bore 1'?" in the adjacent portions of the barrel andcasings 111 and A15, respectively.

The plunger 13 is slidably mounted in the bore 17 of the barrel 1d withthe enlarged shank 19 thereof confined within the passage 18 to projectexteriorly ofthe casing 15, it be ingrr normally urged outwardly by theaction of a spiral spring 20, which encircles the plunger 13 within thepassage 18 intermediate to transmission locks the shoulders defined bythe reduced bore 17 and the shank 19. h A locking pin 21. of standardconstruction isoperatively connected to the tumblerlock 16 whichcontrols its sliding movement in a passage 22, disposed normal to theshank 19 in the casing 15. The pin Q1 is normally urged in the directionof the shank 19 to contact therewith by means ofa spring 23 positionedwithin the passage 22 intermediate the closed end 'thereof and anextremity of the pin 21, the other extremity thereof being lodged in arecess 211- provided in the shank19 to pre vent retraction of theplunger 13 when it is moved to its extreme downward position in locking;engagement with `the gear shifting rods 11, supra. The plunger 13 isreleased from.` locking engagement with the gear shifting rods 11 bymanipulating a key 25 individual to 'the tumbler 16 whereby the pin 21is retracted against the action of the spring 23 to permitthe plunger 13to move outwardly owing to the spring` 20 positioned within the passage18.

In'order to effectively and conveniently lock the barrel 14 to thetransmission housing, 10, simple means are provided to enable theconvenient assembly thereof, as well as to prevent unauthorized removal.The means, in this instance, comprise a plurality of radiallyprojecting,- apertures 2G and 27 which communi'cate with the bore 17 ofthe barrel 14 to permit the insertion of pins 28 and Q9, rcspectively,therein, to assume a position within the apertures 26 and 27, the pinshaving,y the Shanks thereof projecting enteriorly of the barrel 14; withthe enlarged heads 30 thereof engaging an annular ring 31 projectingwithin `the apertures intermediate the ends thereof. The exteriorlyproiecting shanks of the pins 28 and 29 engagel correspondingly spacedapertiilres 32 provided in the transmission housiijlg 10 adjacent thebarrel 111 whereby removal of the latter is rendered impossible.

rlhe pins 23 and 29 are retained within their "respective apertures bymeans of the pliiingei' lll() is retracted by the key to its innermostposition which permits the extremity of the pin to project within theslot 33 at all times.y To

enable the removal of the plunger 13 and the parts associated therewith,a passage 34 is provided in the shank 19 to communicate with the slot 33so that when the plunger is in its normally retracted position, thepassage 34 will be in alignment with the locking pin 21 to which accessis gained by means of a passage provided in the casing 15 incommunication withthe passage 18 and in alignment with the passage 22.

y; With thearrangeinent of parts above def scribed, it willzbefapparentthat the plunger 13 mayv be pressed,downwardly against the action of thespring 20 toengage the recess 12 ,in ,the shifting rod 11 -when thelatter is in apredeterminedposition, thereby locking the vrods 11against movement. AInthis position,

- the .recess 24 confronts the locking pin 21 which is lodged therein bymeans of the spring 23. The plunger 13 is released by manipulating thekey 25 to retract the pin 21 vsuiiieientlytto permit upward movement ofthe plunger 13, the movement of which is limited by theshoulderdefined-bythe slot 33, adapted toengageithe extremity of the locking pin21 -Whenthe latter is in its retracted position. Thus the .pins 28 and29 engage the -shank 19-communicates with the passage 35 in the casing,15 to permit a nail or similar instrument to be inserted therein 'torretracting the locking pins 21 withinthe passage 22 until it is entirelyremoved from the Apassage I am` aware lthat many changes may be made.,and'numerous details of the construcv tion maybe ,varied through a widerange without departing froinlthe principles ot this invention, `and -Itherefore do not purpose limiting the patent grantedhereon, otherwise.than necessitated by theprior art.

I claim kas my invention 1. In a transmission lock, a bariel having anaxial bore, a key operated transmission `locking plunger slidable insaid bore, barrel locking means iiisertablevthrough said bore, and meansvfor `preventing rotation and for limiting the axial .movement of saidplunger to Vmaint-ain said barrel locking means in operativeposition.

2. In a transmission lock, ,a barrel having an axial bore, 4a keyoperated transmission locking plunger slidable in said bore, barrel,locking means insertable ithrough said bore, .and meansforlimitingthe`movement ofsaid plunger to permanently maintain said barrel lockingmeans in operative position, said hariel locking means comprising aradially project-ing pin, said plunger having a transverse passagewayadapted to be alined with an opening in said barrel whereby aninstrument may be inserted in said passageway to unlock said plunger soas to permit of its removal from said barrel.

3. The coinbixiation with a transmission housing, gear shift means insaid housing, a lock bairel removably associated with said housing, aplunger in said barrel engageable with said gear shift means, andlocking means associated with said barrel and housing effective toprevent unauthorized relnoval as wellas rotation of said barrel.

4. The combination with a transmission housing, of gear shift means insaid housing, a non-rotatable lock barrel projecting in said housing, aplunger slidable in said barrel for locking engagementwith said gearshift means, there being aligned apertures in said barrel and housing,and a pin slidable in said apertures to lock said barrel againstrotation and to said housing, said plunger prevent-ing retraction ofsair pin.

5. The combination with a transmission housing, of gear shift means insaid housing, a lock barrel projecting in said housing, a plungerslidable in said barrel for locking engagement-with said gear shiftmeans, there being aligned apertures in said barrel and housing, a pinslidable in said apertures to lock said barrel to said housing, saidplunger preventing retraction of said pin, and means for limiting themovement of said plunger to an extent sufiieient to maintain saidplunger in engagement with said pin.

6. The combination with a transmission housing, of gear shifting meanstherein, a lock barrel associated with said housing, means for lockingsaid barrel to said housing, a plunger in said barrel engageable withsaid gear shift means in a predetermined position, and means forlimiting the movement of said plunger in said barrel, said limitingmeans including a, key operated locking pin, there being a recessed seatin said plunger with a communicating slot for receiving said lockingpin.

7. The con'ihination with a transmission housing, ot' gear shiftingmeans therein, a lock barrel associated with said housing, means forlocking said barrel to said housingaplunger in said barrel engageablewith said gear shift means in a predetermined position, means forlimiting the movement of said plunger in said barrel, said limitingmeans including a key operated locking pin, there being a recessed seatin said plunger with a communicating slot for receiving said lockingpin, and radially extending, exteriorly projectingpins in said barrel toengage said housing, said pins being irremovable Within the limitedmovement of said plunger.

8. The combination with a housing, of a locking barrel, a plungermovable therein, a key operated locking pin engaging said plunger in apredetermined position `for preventing movement thereof, said lockingpin being effective to limit the movement of said plunger in a retractedposition, and means projecting exteriorly of said barrel for lock ingsaid barrel to said housing, said eXteriorly projecting means beingirremovable Within the limited movement of said plunger.

9. In combination with a transmission including gear shift means and ahousing, a

leek barrel associated with said housing, a plunger .in said barrelarranged for engagement with said gear shift means, andlocking means forsaid plunger in said barrel ineluding a bolt in a recess insaid barrelarranged so as to project into a recess in said plunger, said barrelhaving an opening in alinement With said bolt recess and said plungerhaving a transverse passageway arranged or alinement With said boltrecess and said opening.

In testimony whereof I have hereunto suhscrbed my name.

COLVIN L. JOHNSON.

